:root {
    --bg: #07090f;
    --s1: #0c0f17;
    --s2: #111620;
    --s3: #171d2b;
    --b1: #1e2535;
    --b2: #2a3347;
    --t1: #dde4f0;
    --t2: #8892a4;
    --t3: #4a5568;
    --acc: #00e5ff;
    --acc2: #0099b8;
    --add: #23d18b;
    --add-bg: rgba(35, 209, 139, .1);
    --add-b: rgba(35, 209, 139, .35);
    --del: #f47067;
    --del-bg: rgba(244, 112, 103, .1);
    --del-b: rgba(244, 112, 103, .35);
    --chg: #f0a500;
    --chg-bg: rgba(240, 165, 0, .09);
    --chg-b: rgba(240, 165, 0, .3);
    --mono: 'IBM Plex Mono', monospace;
    --sans: 'Space Grotesk', sans-serif;
    --r: 8px
}

*,
::before,
::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0
}

html {
    scroll-behavior: smooth
}

body {
    font-family: var(--sans);
    background: var(--bg);
    color: var(--t1);
    min-height: 100vh;
    overflow-x: hidden
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background: radial-gradient(ellipse 80% 50% at 50% -10%, rgba(0, 229, 255, .06), transparent),
        radial-gradient(ellipse 60% 40% at 80% 110%, rgba(35, 209, 139, .04), transparent)
}

.w {
    position: relative;
    z-index: 1;
    max-width: 1560px;
    margin: 0 auto;
    padding: 2rem 1.5rem 5rem
}

/* HEADER */
.hd {
    text-align: center;
    padding: 2.5rem 0 2rem
}

.hd-top {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    background: rgba(0, 229, 255, .06);
    border: 1px solid rgba(0, 229, 255, .15);
    border-radius: 99px;
    padding: .35rem 1rem .35rem .6rem;
    margin-bottom: 1.2rem
}

.hd-badge {
    background: var(--acc);
    color: #000;
    font-size: .6rem;
    font-weight: 700;
    letter-spacing: .1em;
    padding: .2rem .5rem;
    border-radius: 99px;
    text-transform: uppercase
}

.hd-sub {
    font-size: .75rem;
    color: var(--t2);
    letter-spacing: .06em
}

h1 {
    font-size: clamp(2.2rem, 6vw, 3.8rem);
    font-weight: 700;
    letter-spacing: -.04em;
    line-height: 1.1;
    margin-bottom: .6rem
}

h1 .dx {
    color: var(--acc)
}

.hd-desc {
    color: var(--t2);
    font-size: .9rem;
    max-width: 520px;
    margin: 0 auto
}

/* TABS */
.tabs {
    display: flex;
    gap: .3rem;
    background: var(--s1);
    border: 1px solid var(--b1);
    border-radius: 10px;
    padding: .35rem;
    margin: 2rem 0 1.5rem;
    width: fit-content
}

.tab {
    font-family: var(--sans);
    font-size: .78rem;
    font-weight: 600;
    padding: .5rem 1.2rem;
    border-radius: 7px;
    border: none;
    background: none;
    color: var(--t3);
    cursor: pointer;
    transition: all .15s;
    letter-spacing: .02em
}

.tab.on {
    background: var(--s3);
    color: var(--t1);
    box-shadow: 0 1px 4px rgba(0, 0, 0, .4)
}

.tab:hover:not(.on) {
    color: var(--t2)
}

/* TOOLBAR */
.bar {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    align-items: center;
    background: var(--s1);
    border: 1px solid var(--b1);
    border-radius: 10px;
    padding: .8rem 1.1rem;
    margin-bottom: 1.2rem
}

.bg {
    display: flex;
    gap: .3rem;
    align-items: center
}

.bg+.bg {
    padding-left: .8rem;
    border-left: 1px solid var(--b1)
}

.bl {
    font-size: .65rem;
    color: var(--t3);
    text-transform: uppercase;
    letter-spacing: .1em;
    white-space: nowrap;
    margin-right: .1rem
}

.btn {
    font-family: var(--sans);
    font-size: .75rem;
    font-weight: 600;
    padding: .38rem .85rem;
    border-radius: 6px;
    border: 1px solid var(--b1);
    background: var(--s2);
    color: var(--t2);
    cursor: pointer;
    transition: all .15s;
    white-space: nowrap
}

.btn:hover {
    background: var(--s3);
    color: var(--t1)
}

.btn.on {
    background: rgba(0, 229, 255, .12);
    color: var(--acc);
    border-color: rgba(0, 229, 255, .3)
}

.btn.act {
    background: var(--acc);
    color: #000;
    border-color: transparent;
    font-weight: 700
}

.btn.act:hover {
    background: #33eaff;
    box-shadow: 0 0 16px rgba(0, 229, 255, .3)
}

.ck {
    display: flex;
    align-items: center;
    gap: .35rem;
    cursor: pointer;
    user-select: none
}

.ck input {
    appearance: none;
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 3px;
    border: 1px solid var(--b2);
    background: var(--s2);
    cursor: pointer;
    flex-shrink: 0;
    position: relative;
    transition: all .15s
}

.ck input:checked {
    background: rgba(0, 229, 255, .18);
    border-color: var(--acc)
}

.ck input:checked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: .6rem;
    color: var(--acc);
    font-weight: 700
}

.ck span {
    font-size: .72rem;
    color: var(--t2);
    font-weight: 600
}

select {
    font-family: var(--sans);
    font-size: .74rem;
    font-weight: 600;
    padding: .38rem .7rem;
    border-radius: 6px;
    border: 1px solid var(--b1);
    background: var(--s2);
    color: var(--t2);
    cursor: pointer;
    outline: none;
    transition: all .15s
}

select:focus {
    border-color: rgba(0, 229, 255, .3);
    color: var(--t1)
}

/* PANELS */
.panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem
}

.panel-hd {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: .55rem .9rem;
    background: var(--s2);
    border: 1px solid var(--b1);
    border-bottom: none;
    border-radius: var(--r) var(--r) 0 0
}

.p-title {
    font-size: .68rem;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase
}

.p-title.orig {
    color: var(--del)
}

.p-title.mod {
    color: var(--add)
}

.p-meta {
    font-size: .65rem;
    color: var(--t3);
    font-family: var(--mono)
}

textarea {
    width: 100%;
    min-height: 210px;
    padding: 1rem;
    border: 1px solid var(--b1);
    border-top: none;
    border-radius: 0 0 var(--r) var(--r);
    background: var(--s1);
    color: var(--t1);
    font-family: var(--mono);
    font-size: .8rem;
    line-height: 1.75;
    resize: vertical;
    transition: border-color .2s;
    tab-size: 2
}

textarea:focus {
    outline: none;
    border-color: rgba(0, 229, 255, .25)
}

textarea::placeholder {
    color: var(--t3)
}

.pf {
    display: flex;
    gap: .4rem;
    padding: .45rem 0
}

.pf .btn {
    font-size: .7rem;
    padding: .28rem .6rem
}

/* ACTION */
.ac {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 1rem 0 2rem;
    flex-wrap: wrap
}

.cbtn {
    font-family: var(--sans);
    font-size: .95rem;
    font-weight: 700;
    letter-spacing: .03em;
    padding: .85rem 2.8rem;
    border: none;
    border-radius: 9px;
    cursor: pointer;
    background: var(--acc);
    color: #000;
    box-shadow: 0 0 0 0 rgba(0, 229, 255, 0);
    transition: all .2s;
    position: relative;
    overflow: hidden
}

.cbtn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, .18), transparent);
    opacity: 0;
    transition: opacity .2s
}

.cbtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(0, 229, 255, .3)
}

.cbtn:hover::before {
    opacity: 1
}

.cbtn:active {
    transform: translateY(0)
}

/* STATS */
.stats {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    background: var(--s1);
    border: 1px solid var(--b1);
    border-radius: 10px;
    padding: 1.1rem 1.4rem;
    margin-bottom: 1.2rem;
    align-items: center
}

.st {
    text-align: center;
    flex: 1;
    min-width: 72px
}

.sv {
    font-size: 1.8rem;
    font-weight: 700;
    font-family: var(--mono);
    line-height: 1
}

.sl {
    font-size: .62rem;
    color: var(--t3);
    text-transform: uppercase;
    letter-spacing: .1em;
    margin-top: .2rem
}

.sim-w {
    flex: 2;
    min-width: 150px;
    display: flex;
    flex-direction: column;
    gap: .35rem
}

.sim-l {
    font-size: .65rem;
    color: var(--t2);
    text-transform: uppercase;
    letter-spacing: .08em
}

.sim-b {
    height: 5px;
    background: var(--s3);
    border-radius: 99px;
    overflow: hidden
}

.sim-f {
    height: 100%;
    border-radius: 99px;
    background: linear-gradient(90deg, var(--del), var(--chg) 50%, var(--add));
    transition: width .5s cubic-bezier(.4, 0, .2, 1)
}

/* RESULT HEADER */
.rh {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: .6rem;
    margin-bottom: .6rem
}

.rt {
    font-size: .7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em;
    color: var(--t2)
}

.nav {
    display: flex;
    align-items: center;
    gap: .4rem
}

.nb {
    width: 28px;
    height: 28px;
    border-radius: 5px;
    border: 1px solid var(--b1);
    background: var(--s2);
    color: var(--t2);
    cursor: pointer;
    font-size: .85rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all .15s
}

.nb:hover {
    background: var(--s3);
    color: var(--t1)
}

.nb:disabled {
    opacity: .3;
    cursor: not-allowed
}

.np {
    font-size: .72rem;
    color: var(--t2);
    font-family: var(--mono);
    min-width: 52px;
    text-align: center
}

/* DIFF OUTPUT */
.do {
    background: var(--s1);
    border: 1px solid var(--b1);
    border-radius: 10px;
    overflow: hidden;
    font-family: var(--mono);
    font-size: .78rem
}

.empty {
    padding: 4rem;
    text-align: center;
    color: var(--t3);
    font-family: var(--sans);
    font-size: .95rem;
    line-height: 2
}

.empty strong {
    color: var(--t2)
}

/* Inline diff lines */
.dl {
    display: flex;
    align-items: stretch;
    border-bottom: 1px solid rgba(30, 37, 53, .7);
    transition: background .1s
}

.dl:last-child {
    border-bottom: none
}

.dl:hover {
    background: rgba(255, 255, 255, .015)
}

.dl.a {
    background: var(--add-bg);
    border-left: 3px solid var(--add-b)
}

.dl.d {
    background: var(--del-bg);
    border-left: 3px solid var(--del-b)
}

.dl.c {
    background: var(--chg-bg);
    border-left: 3px solid var(--chg-b)
}

.dl.s {
    opacity: .38;
    border-left: 3px solid transparent
}

.dl.col {
    background: var(--s2);
    opacity: 1;
    cursor: pointer;
    border-left: 3px solid transparent
}

.dl.col:hover {
    background: var(--s3)
}

.ln {
    min-width: 42px;
    padding: .4rem .55rem;
    color: var(--t3);
    text-align: right;
    user-select: none;
    border-right: 1px solid var(--b1);
    font-size: .68rem;
    line-height: 1.85;
    flex-shrink: 0
}

.ds {
    padding: .4rem .45rem;
    font-weight: 700;
    line-height: 1.85;
    flex-shrink: 0;
    width: 18px;
    text-align: center
}

.a .ds {
    color: var(--add)
}

.d .ds {
    color: var(--del)
}

.c .ds {
    color: var(--chg)
}

.s .ds {
    color: var(--t3)
}

.dt {
    flex: 1;
    padding: .38rem .8rem;
    white-space: pre-wrap;
    word-break: break-all;
    line-height: 1.85
}

/* token highlights */
.ta {
    background: rgba(35, 209, 139, .2);
    color: #6ee7b7;
    border-radius: 3px;
    padding: 0 2px
}

.td {
    background: rgba(244, 112, 103, .2);
    color: #fca5a5;
    border-radius: 3px;
    padding: 0 2px;
    text-decoration: line-through
}

/* Syntax + prism override: prism renders inside .dt */
.dt code[class*=language-],
.dt pre[class*=language-] {
    background: none !important;
    padding: 0 !important;
    margin: 0 !important;
    border: none !important;
    box-shadow: none !important;
    font-family: var(--mono) !important;
    font-size: inherit !important;
    line-height: inherit !important;
    white-space: pre-wrap !important;
    word-break: break-all !important;
    text-shadow: none !important
}

/* SBS */
.sbs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    overflow-x: auto
}

.sp+.sp {
    border-left: 2px solid var(--b1)
}

.sh {
    padding: .45rem .8rem;
    background: var(--s2);
    border-bottom: 1px solid var(--b1);
    font-size: .65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .1em
}

.sh.L {
    color: var(--del)
}

.sh.R {
    color: var(--add)
}

.sl2 {
    display: flex;
    align-items: stretch;
    min-height: 26px;
    border-bottom: 1px solid rgba(30, 37, 53, .5)
}

.sl2.a {
    background: var(--add-bg)
}

.sl2.d {
    background: var(--del-bg)
}

.sl2.c {
    background: var(--chg-bg)
}

.sl2.s {
    opacity: .38
}

.sl2.e {
    background: rgba(0, 0, 0, .18);
    opacity: .5
}

.sl2 .ln {
    border-right: 1px solid var(--b1)
}

.sl2 .dt {
    padding: .3rem .65rem;
    font-size: .76rem
}

.colinfo {
    padding: .35rem .8rem;
    color: var(--t3);
    font-size: .68rem;
    font-style: italic;
    font-family: var(--sans)
}

/* ═══ IMAGE DIFF ═══ */
.img-panels {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem
}

.img-drop {
    border: 2px dashed var(--b2);
    border-radius: 10px;
    background: var(--s1);
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: .8rem;
    cursor: pointer;
    transition: all .2s;
    position: relative;
    overflow: hidden
}

.img-drop:hover,
.img-drop.over {
    border-color: var(--acc);
    background: rgba(0, 229, 255, .04)
}

.img-drop img {
    max-width: 100%;
    max-height: 300px;
    border-radius: 6px;
    object-fit: contain
}

.img-drop .ph {
    color: var(--t3);
    font-size: .85rem;
    text-align: center;
    pointer-events: none
}

.img-drop .ph strong {
    display: block;
    font-size: 1.4rem;
    margin-bottom: .3rem;
    opacity: .4
}

.img-drop input[type=file] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer
}

.img-result {
    background: var(--s1);
    border: 1px solid var(--b1);
    border-radius: 10px;
    padding: 1.2rem;
    margin-bottom: 1rem
}

.img-result canvas {
    max-width: 100%;
    border-radius: 6px;
    display: block;
    margin: 0 auto
}

.img-stats {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
    flex-wrap: wrap
}

.img-st {
    font-size: .75rem;
    color: var(--t2)
}

.img-st strong {
    color: var(--t1);
    display: block;
    font-size: 1.1rem;
    font-family: var(--mono)
}

.diff-view-btns {
    display: flex;
    gap: .4rem;
    margin-bottom: .8rem;
    flex-wrap: wrap
}

/* SHARE */
.share-row {
    display: flex;
    gap: .5rem;
    align-items: center;
    background: var(--s2);
    border: 1px solid var(--b1);
    border-radius: 8px;
    padding: .6rem .9rem;
    margin-bottom: 1rem
}

.share-url {
    flex: 1;
    font-family: var(--mono);
    font-size: .72rem;
    color: var(--t2);
    word-break: break-all;
    line-height: 1.5;
    max-height: 40px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap
}

/* TOAST */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(150%);
    background: var(--s2);
    border: 1px solid var(--acc);
    border-radius: 8px;
    padding: .7rem 1.4rem;
    color: var(--acc);
    font-size: .82rem;
    font-weight: 600;
    z-index: 200;
    transition: transform .28s cubic-bezier(.4, 0, .2, 1);
    white-space: nowrap
}

.toast.show {
    transform: translateX(-50%) translateY(0)
}

/* FOOTER */
.ft {
    margin-top: 4rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--b1);
    text-align: center;
    color: var(--acc);
    font-size: .75rem;
    line-height: 2
}

@media(max-width:740px) {

    .panels,
    .img-panels {
        grid-template-columns: 1fr
    }

    .bar {
        gap: .35rem
    }

    .bg+.bg {
        border-left: none;
        padding-left: 0
    }

    .sbs {
        grid-template-columns: 1fr
    }

    .sp+.sp {
        border-left: none;
        border-top: 2px solid var(--b1)
    }

    h1 {
        font-size: 2rem
    }

    .tabs {
        width: 100%
    }

}

/* ═══ MOBILE RESPONSIVE FIXES ═══ */
@media (max-width: 740px) {

    /* Wrapper padding */
    .w {
        padding: 1rem 0.75rem 4rem;
    }

    /* Header */
    .hd {
        padding: 1.5rem 0 1.2rem;
    }

    h1 {
        font-size: clamp(1.8rem, 9vw, 2.4rem);
    }

    .hd-desc {
        font-size: .82rem;
    }

    /* Tabs — full width, equal split */
    .tabs {
        width: 100%;
        display: grid;
        grid-template-columns: 1fr 1fr;
    }

    .tab {
        text-align: center;
        padding: .6rem .5rem;
        font-size: .78rem;
    }

    /* Toolbar — stack each group vertically, remove separators */
    .bar {
        flex-direction: column;
        align-items: stretch;
        gap: .6rem;
        padding: .8rem;
    }

    .bg {
        flex-wrap: wrap;
        gap: .35rem;
        width: 100%;
        padding-left: 0 !important;
        border-left: none !important;
    }

    /* Label row above buttons */
    .bl {
        width: 100%;
        margin-bottom: .1rem;
        font-size: .6rem;
    }

    /* Buttons — touch-friendly min size */
    .btn {
        min-height: 36px;
        padding: .42rem .75rem;
        font-size: .74rem;
        flex: 1;
        text-align: center;
        min-width: 60px;
    }

    /* Action buttons row (Swap/Share/Export/Copy/Clear) — wrap into grid */
    .bg-actions {
        margin-left: 0 !important;
        display: grid !important;
        grid-template-columns: 1fr 1fr 1fr;
        gap: .35rem;
        width: 100%;
    }

    .bg-actions .btn {
        min-height: 40px;
        font-size: .72rem;
        padding: .4rem .3rem;
        text-align: center;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    /* Lang select — full width */
    select {
        width: 100%;
        min-height: 36px;
        font-size: .8rem;
    }

    /* Checkboxes row */
    .ck {
        min-height: 36px;
    }

    .ck span {
        font-size: .75rem;
    }

    /* Panels — single column */
    .panels,
    .img-panels {
        grid-template-columns: 1fr;
    }

    /* Textareas */
    textarea {
        min-height: 160px;
        font-size: .78rem;
    }

    /* Panel footer buttons */
    .pf {
        flex-wrap: wrap;
    }

    .pf .btn {
        flex: 1;
        min-width: 70px;
        min-height: 36px;
    }

    /* Compare button */
    .cbtn {
        width: 100%;
        padding: .9rem 1rem;
        font-size: 1rem;
    }

    /* Stats */
    .stats {
        padding: .8rem 1rem;
        gap: .7rem;
    }

    .sv {
        font-size: 1.4rem;
    }

    /* Side by side */
    .sbs {
        grid-template-columns: 1fr;
    }

    .sp+.sp {
        border-left: none;
        border-top: 2px solid var(--b1);
    }

    /* Result header */
    .rh {
        flex-wrap: wrap;
    }

    /* Share row */
    .share-row {
        flex-wrap: wrap;
    }

    .share-url {
        width: 100%;
        max-height: 52px;
        white-space: normal;
    }

    /* Image diff view buttons */
    .diff-view-btns {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: .4rem;
    }

    .diff-view-btns .btn {
        min-height: 38px;
    }

    /* Image stats */
    .img-stats {
        gap: .8rem;
    }

    /* Toast */
    .toast {
        width: 90%;
        text-align: center;
        white-space: normal;
        font-size: .78rem;
    }

    /* Footer */
    .ft {
        margin-top: 2.5rem;
        font-size: .7rem;
    }
}

/* Extra small screens */
@media (max-width: 380px) {
    .btn {
        font-size: .68rem;
        padding: .38rem .5rem;
    }

    h1 {
        font-size: 1.7rem;
    }

    .bg-actions .btn {
        font-size: .65rem;
        padding: .38rem .2rem;
    }
}